Brake shoe



Patented May 9, 1933 UNITED- STATES PATENT OFFICE LUDGER E. LA BRIE, OF SOUTH BEND, INDIANA, ASSIGNOR TO BENDIX BRAKE COM- I PANY, OF SOUTH'BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE snoE Original application filed February 14,

This invention relates to method of forming brake shoes and is illustrated as embodied in a novel manner of fabricating shoes for an internal expanding automobile brake.

An object of the invention is to provide strong and light but inexpensive shoes by building each shoe of an arcuate outer band for the lining and a flat stiffening web member secured to the hand by a series of spacedthe welding current intermittently "and progressively through a plurality oflimited contiguous areas in the rim and web. By my novel method of fabricating these shoes, the time element is appreciatively reduced, in that all of the spaced welds are made simultaneously. By my novel process a simpler apparatus is alsopossible than that heretofore used, in that but two electrodes enveloping the entire shoe are made to approach each other in the clamping operation. thus obviating the more or less complicated apparatus necessary to effect the intermittent welding heretofore described.

The above and other objects and novel steps contemplated by the invention and the pronounced advantages of my improved process will more fully appear from the following specification and claims.

In the drawing used to illustrate one application of the invention Figure 1 is a side elevation of the brake shoe and welding electrodes assembled therewith Figure 2 is a transverse section taken on the line 22 of Figure 1;

Figure 3 is a transversesection taken on the line 33 of Figure 1; and

Figure 4 is a section corresponding to Figure 2 disclosing apparatus as applied to 1927, Serial No. 168,044. Divided and this application filed August 19, 1929. Serial No. 386,829.

the, welding of a double webbed brake shoe.

As disclosed in Figures 1, 2 and 3 of the drawing showing a preferred form of effect ing my invention, the brake shoe to be assembled by my novel process includes an outer arcuate band 10, to which the conventional woven brake lining may be riveted or otherwise secured, and a fiat stiffening web member 12 which extends below the lower end of the band 10 as a pivot arm.

According to my proposed manner of assembling these parts, the web 12 is first notched or scalloped along its outer edge to form a series of projections 14. An arcuate rim member 10 is then superposed upon the peripheral edge of the Web and held in place by an outer electrode 16 characterized by having annular arch-shaped recesses 18 ex tending on each side of the electrode and longitudinally throughout its length and also by spaced transversely extending arched openings 20, this construction resulting in centrally located projections 22 which are spaced to lie immediately above the projections 1% in the periphery of the web. The web member 12 is now enveloped by a lower electrode 24 and clamped thereto in any approved manner. through the electrodes, which current divides in parallel along the projections 14 which are thus simultaneously spot welded to the band 10.

The upper electrode 16 is insulated from the rim surface by short sections of insulating material 25 interposed between the edges of the electrodes and the contiguous rim face. Such insulating material serves the purpose of concentrating the current at the projections 22 which is the desideratum.

In Figure 4 l have disclosed a similar apparatus for effecting the welded bond between a rim 26 and two webs 28, the outer electrode being shaped to provide. two spaced series of projections 30 similar to the projections shown in the electrode of Figure 2.

There is thus effected, in a minimum of operations, a. very effective bond between the rim and web portions of the shoe effectively withstanding the unusual stresses Current is then passed ltd such as side thrust and sheer, to which these parts are subjected.

While one particular manner of effecting the shoe has been described in detail, it is not my intention to limit the scope of the invention by that description or otherwise than by .the terms of the appended claims.

This case constitutes a division of my copending application No. 168,044, filed F ebruary 14,1927.

I claim:

1. The method of forming brake shoes Which comprises first forming the web thereof with spaced projections along its outer marginal edge, clamping said web to an electrode, placing the rim of the shoe in position on said web member, and uniting said web member and said rim member b simultaneously pressing the same toget er and passing a current between said web and rim members from localized areas opposite said projections.

2. The method of forming a brake shoe which comprises first forming the rim member of the shoe to a certain curvature, forming theweb member of the shoe with spaced projections .on the rim-abutting edge thereof, clamping the web member to an electrode, positioning the rim member on the spaced projections of the web member, pressing said members together throughout their length by a second electrode contacting said rim member, and passing a welding cur rent between said web member and rim member from localized areas opposite said projections.

3. The method of forming brake shoes which comprises forming the web thereof with spaced projections on the marginal edge thereof, clamping said web to an electrode, forming a second electrode with spaced projections, placing the rim of the shoe in position on said web member, placing said second electrode in position with said projections thereon aligned with said projections on said web member, and uniting said web and rim members by passing current through localized areas only and ap-- plying pressure.

In testimony whereof I have hereunto signed my name.

LUDGER E. LA BRIE. 

